The differential activity of insecticides on life stages of rice water weevil, Lissorhoptrus oryzophilus, in rice plants treated as seeds with chlorantaniliprole (CAP) and thiamethoxam (TMX) were related to patterns of insecticide distribution (6-7 leaf stage). The differential activity on adults suggests poor inherent potency of CAP as an adulticide and/or its limited systemicity in foliage. The greatest activity of CAP on root feeding stages was consistent with the accumulation of CAP in roots, whereas the high adulticidal activity of TMX correlated with high above-ground concentrations of TMX. These results showed a potential for optimizing field use rates of CAP. A novel method was employed to determine dose dependence of adult mortality following exposure to foliage from TMX-treated plants (2-3 and 3-4 leaf stages). To estimate oral doses of insecticides, estimates of leaf biomass removed by adult weevils were used in conjunction with LC/MS-MS analysis of insecticide residues in leaves.

Activity of chlorantraniliprole and thiamethoxam seed treatments on rice water weevil as affected by distribution of insecticides in rice plants

246th National Meeting (2013)

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